How can I brand a fifth War Chief?

My current quest is to brand five War Chiefs, but as you can see I only have 4 available and they're all branded already.
How can I progress my game? Do I need to command an uruk to become the fifth war chief, if that's possible.
I am unsure of how to progress at this stage.
Each of the dominated war chiefs has a mission, which just summons them. As they're branded they just stroll up to me and I can grab them and dominate them again. Then once I've dominated them the mission just lights up again and I can repeat it.
Best Answer
You have to wait for another Uruk to be promoted.
The easiest way is to choose the "Advance Time" option on a forge tower. The same thing will be triggered if you die. Alternatively, continue playing and promotions will slowly trickle in.
If you manage to brand the remaining captains before the promotion happens, you're guarenteed a free branded warchief.
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How do you brand a Warchief?
there's three way to brand warchiefs:How to brand a Warchief in shadow of mordor?
After the Captain's health bar turn green, you need to grab him and select the option to dominate. Then, you need to Command him. After the window of the army loads up, select one of the Warchiefs and have the dominated Captain start the actions that will get him promoted.What do I do after branding 5 Warchiefs?
Once you've branded the Warchiefs, you are ready for the final missions. Head to the dock at the Sea of Nurnen to begin the first of the final missions here. Note that you'll be able to return to Nurn before the very last mission.How do you make an Uruk a Warchief?
Press Triangle or Y to Command him and then select the empty spot. Choose Infiltrate and then your Captain will be promoted to Warchief.Middle-Earth: Shadow of Mordor Walkthrough Part 24 - Branding the Warchiefs P1
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